var padManager = require('../../db/PadManager');
var url = require('url');

exports.expressCreateServer = function (hook_name, args, cb) {
  //redirects browser to the pad's sanitized url if needed. otherwise, renders the html
  args.app.param('pad', function (req, res, next, padId) {
    //ensure the padname is valid and the url doesn't end with a /
    if(!padManager.isValidPadId(padId) || /\/$/.test(req.url))
    {
      res.status(404).send('Such a padname is forbidden');
      return;
    }

    padManager.sanitizePadId(padId, function(sanitizedPadId) {
      //the pad id was sanitized, so we redirect to the sanitized version
      if(sanitizedPadId != padId)
      {
        var real_url = sanitizedPadId;
        real_url = encodeURIComponent(real_url);
        var query = url.parse(req.url).query;
        if ( query ) real_url += '?' + query;
        res.header('Location', real_url);
        res.status(302).send('You should be redirected to <a href="' + real_url + '">' + real_url + '</a>');
      }
      //the pad id was fine, so just render it
      else
      {
        next();
      }
    });
  });
}
